From GameBrew - a wiki dedicated to Video Game Homebrew.
FPS Maker is in essence a first person shooter-type game engine for the DS accompanied by an embedded level editor.
It is submitted to the NEO Retro Coding Compo 2012 and raked 1st in APP section.
Download and extract file.
Copy all files to cartridge and making sure /fpsm/ folder is in the root directory.
With FPS Maker, you can create materials, control lighting and add enemies within a room to create the very own first person shooter on DS.
A tutorial can be found from the discussion thread.
ACOTSYE is a first person shooter made by the developer using the FPS Maker engine.
D-Pad - Move the grid around
R/L - Zoom in and out of the grid
A/B/X/Y - Navigate the map preview